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Abstract
In this work, an experimental analysis of the performance of different types of quasi-randomly distributed reflectors inscribed into a single-mode fiber as a sensing mirror is presented. These artificially-controlled backscattering fiber reflectors are used in short linear cavity fiber lasers. In particular, laser emission and sensor application features are analyzed when employing optical tapered fibers, micro-drilled optical fibers and 50 μm-waist or 100 μm-waist micro-drilled tapered fibers (MDTF). Single-wavelength laser with an output power level of about 8.2 dBm and an optical signal-to-noise ratio of 45 dB were measured when employing a 50 μm-waist micro-drilled tapered optical fiber. The achieved temperature sensitivities were similar to those of FBGs; however, the strain sensitivity improved more than one order of magnitude in comparison with FBG sensors, attaining slope sensitivities as good as 18.1 pm/με when using a 50 μm-waist MDTF as distributed reflector.
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1 Public University of Navarra, Department of Electrical Electronic and Communication Engineering, Pamplona, Spain (GRID:grid.410476.0) (ISNI:0000 0001 2174 6440); Public University of Navarra, Institute of Smart Cities (ISC), Pamplona, Spain (GRID:grid.410476.0) (ISNI:0000 0001 2174 6440)
2 University of Cantabria, Photonics Engineering Group, Santander, Spain (GRID:grid.7821.c) (ISNI:0000 0004 1770 272X); Instituto de Salud Carlos III, CIBER-Bbn, Madrid, Spain (GRID:grid.413448.e) (ISNI:0000 0000 9314 1427); Instituto de Investigacion Sanitaria Valdecilla (IDIVAL), Cantabria, Spain (GRID:grid.476458.c)
3 Instituto de Salud Carlos III, CIBER-Bbn, Madrid, Spain (GRID:grid.413448.e) (ISNI:0000 0000 9314 1427)